How to grab POST data from external site

Question

An external site redirect the user to my platform passing some POST data. How can grab this information from my Bean and display its in a JSF page?

I've try a lot of solution but no one works. The following is a JSF testing page.

 <f:metadata>
  <f:viewParam name="auth" value="#{getResponse2.auth}" required="true"/>
 </f:metadata>

<ui:define name="content">
    <center>
       An error occurred during  transaction
        #{getResponse2.auth}<br />
        #{getResponse2.responsecode}
    </center>

Here some attempt to grab POST data:

@ManagedBean
@RequestScoped
public class getResponse extends HttpServlet {
   private String paymentId;
   private String result;
   private String auth;
   private String ref;
   private String traind;
   private String trackid;
   private String udf1;
   private String responsecode;
   private String host;
   @Override
   public void doPost(HttpServletRequest request, HttpServletResponse response) {
      paymentId = request.getParameter("paymentid");
      result = request.getParameter("result");
      auth = request.getParameter("auth");
      ref = request.getParameter("ref");
      traind = request.getParameter("tranid");
      trackid = request.getParameter("trackid");
      udf1 = request.getParameter("udf1");
      responsecode = request.getParameter("responsecode");
      System.out.println("response code: " + responsecode);
  }

Another one:

   public void getResponse() {

    paymentId = ((HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest()).getParameter("paymentId");
    result = ((HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest()).getParameter("result");
    auth = ((HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest()).getParameter("auth");
    ref = ((HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest()).getParameter("ref");
    traind = ((HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest()).getParameter("traind");
    trackid = ((HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest()).getParameter("trakid");
    udf1 = ((HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest()).getParameter("udf1");
    responsecode = ((HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest()).getParameter("responsecode");

}

Redirect and "POST data"? A redirect is always GET. Are you absolutely positive that the incoming HTTP request is a POST request and not a GET? By the way, letting your managed bean class extend `HttpServlet` really doesn't make any sense. The "another one" approach should theoretically work, provided that it's invoked the right way (that is, by a GET request). — BalusC, Nov 13 '13 at 12:20
Will it even work with extending HttpServlet and declaring it as @RequestScoped? — Artem Moskalev, Nov 13 '13 at 12:22
@BalusC I think you are ready, it's possible that the data are GET. I've only this example in the documentation: String result = request.getParameter("result"); In the GET case how can grab the parameters? — Enrico Morelli, Nov 13 '13 at 12:54
@BalusC I'm not able to find examples how to grab GET data. Is it so complicated? — Enrico Morelli, Nov 14 '13 at 08:58
@BalusC In my searches I found your tutorials http://balusc.blogspot.it/2011/09/communication-in-jsf-20.html#ProcessingGETRequestParameters but I don't find a solution for my problem. — Enrico Morelli, Nov 14 '13 at 09:09
This question is not answerable without detailed information about the incoming HTTP request. If you have no clue, use a HTTP traffic monitor like Fiddler. — BalusC, Nov 14 '13 at 14:27
Now the bank staff tell me that the data are transmitted using POST. — Enrico Morelli, Nov 14 '13 at 15:33
From the bank documentation I have: Protocol: HTTP, Method: POST, Content-Type: URL Encoded (legacy): application/www-form-urlencoded or application/x-www-form-urlencoded — Enrico Morelli, Nov 14 '13 at 15:34
There is also an example of a page that grab the response: <% long paymentID = Long.parseLong(request.getParameter("paymentid")); String result = request.getParameter("result"); String auth = request.getParameter("auth"); long ref = Long.parseLong(request.getParameter("ref")); %> — Enrico Morelli, Nov 14 '13 at 15:39
Nothing to do, the response has to be read by a JSP page that must to redirect to another page. Now I've other problems. Thanks — Enrico Morelli, Nov 18 '13 at 16:16

How to grab POST data from external site

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